Piston for internal-combustion engines



'March 20, 1928. 1 v v R; H. MQQUIDDY i'xswon m INTERNAL comsuswog ENGINES 2 Sheets-Sheet 1 Filed March 23, 1927 I 50 ISSUED-811d that in the latter-figure Patented Mar. 20, 1928.

ROBERT E. MGQUIDDY, F MARSHALL, -MISSOUB,I. V

rls'rou roe INTEBNAL-COMBUSTIOIN enemas.

Application filed March 23, 1327. Serial No. 177,776.

v faces provided on the piston and means for urging these wall sections apart, so that the efl'ective diameter of the piston is increased, while at the same time a solid unyielding wall face is provided in opposition to the wall of the cylinder.

These and other objects I attain bythe construction shown in the accompanylng drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention and where1n:-

F lgure 1 1s a transverse sectional view through a piston constructed in accordance 1 with my invention; I

Figure 2 is a section on the line 2-2 of Figure 1;

Figure 3 is a section through a modified piston construction;

Figure 4 is a sectionon the line 44 of Figure 1; Figure 5 is a rearelevation of the movable wall elements; a

Figure 6 is a detail edge elevation of the spring employed. c

Referring nowumore partlcu'larllly to the drawings, the numeral 10 genera .designates the head section and 11 the s 'rt section of a piston, The skirt section has as- U self-formed noises, such as are occasloned 'sociated therewith the usual bosses 12 for the reception of the wris't'pin snot shown) '40 and the head section 10 is provi ed with the usual ring grooves In accordance 'th' my invention, the

skirt section 11v is formed with two chord-g ally disposed verticallyextending facesll i 'whichmay. either be in alignment with one another, as shown in Figure 1, or be disposed at an angle to one another, as in Fig-' first referred to is ure 3. The structure referred where the diameter of the piston.

the diameter of the piston is large and it is. desired that the movable wall sections 15 associatedowiththese surfaces be reduced in thickness. The faces-of the wall sections 65' 14 are provided with outstanding transsection.

'hereinbefore set forth is capable of a cerversely directed ribs 16 and the adjacent faces of the wall sections 15 are provided with grooves17 for the reception of these ribs. These wall sections havetheir outer faces 18 arcuately curved to, correspond to the curvature of the wall of the. piston and have their adjacent faces recessed adjacent the inner faces thereof to provide a housing 19 for a springer springs 20, which serve to constantly urge the wall sections apart. As illustrated in Figure 6, these springs are preferably of the single sinuous strip type. Each wall section 14 has a slot 21 formed therein within which operates the shank of a pin or screw 22 engaged with the coacting movable wall element 15 and having at the innerface of the wall section 14, a head 23 holding the movable wall'element in proper ion against the outer face of the vwall It is well known that piston slap is caused by looseness of the piston .upon' the diameter transverse to the axis of the piston pin bosses and the chordal faces 14 meet upon this diameter at one side o'fthe piston. It wlll be obvious that when the piston is in place, if there is any space unoccupied by the piston, the springs 20 will force the movable wall sections 15 apart until the piston fills this space, 7 so that the slap will be eliminated- Attention 'is directed to the fact that since these wall sections in each of the constructions above illustrated are either perpendicular to the diameter or nearly so, they will be substantially immovable to" impact in the direction of this diameter and accordingly the piston will be free from by wall sections which are movable in the direction of this diameter as have been proposed by previous, devices of this character with which I am familiar.

It will be obvious that the construction tain range of change and modification and I accordingly do not limit 'myself'to such 1 specific structure except as, hereinafter claimed. 4

Iclaim:'- 1. The combination witha piston embodying the usual head and skirt sections and bosses, of'chordally extending vertically disposed faces formed upon the iston adjacent to and at'opposite sides 0 a diameter thereof perpendicular to theaxis of the 11.

ing the usual head and skirt sections and piston pin bosses, a wall section slidable transversely of 'eachface, means urging the wall sections apart and means preventing vertical movement of the wall sections upon the faces.

2. The combination witha piston embodying the usual head and skirt sections and bosses, of chordally extending vertically dis: posed faces formed upon the piston adjacent to and at opposite sides of a diameter thereofperpendicular to the axis of the pi s-' ton pin bosses, a wall .section slidable transversely of each face, means urging the wall sections apart, each wall face having pro jccting ribs extending transversely thereof, the rear of each wall section having grooves for the reception of said ribs.

3. The combination with a piston embodybosses, of chordally extending vertically disposed faces formed upon the piston adjacent to and at op osite sides of a. diam- -eter thereof perpen icular to the axis of v the piston pin bosses, a wall section slidable transversely of eachface, means urging the wall sections apart and means preventing vertical movement of the wall sections upon the faces, the wall of the piston having a slot at each face and means slidable Within each slot engaging the coacting wall section and having a, head engaging the inner face of the piston wall.

4. The combination with a piston embodying the usual head and skirt sections and bosses; of chordally extending vertically dis posed faces formed upon the iston adjacent to andat opposite sides of a diameter thereof perpendicular to the axis of the piston pin bosses, a. Wall section slidable transversely of each face, means preventing vertical movement of the wall sections-upon the faces, adjacentfaoes of the wall sections of, the rear wall section having grooves 5 for the reception of said ribs, adjacent faces of the wall sections having sockets combining to produce a housing and a spring disposed in said housing and urging the wall sections apart. 7 e

6. The combination with a piston embodying the usual-head and skirt sections and bosses, of chordallyextending vertically dis posed faces formed upon the piston adja-- cent to and at opposite sides of a diameter 6 thereof perpendlcular to the axis of the piston pin bosses, a-wallx section slidabletransversely ofeachface, means urging the I wall sections apart, eachwall' face having projecting ribs extending transversely thereof, therear wall section having grooves for the reception of said ribs, adjacent faces of the Wall sections having sockets combining to produce a housing, a spring disposed in said housing and urging the wall sections apart, each of said faces having a transversely extending slot and means slidable within each slot engaging the associated Wall section and having ahead bearing against the inner face of the piston wall.

In testimonywhereof I hereunto aflix my I signature. 7

ROBERT H. ,MoQUIDDY. 

